पृथ्वी की भूपर्पटी (Crust) में मौजूद निम्नलिखित प्रमुख तत्वों को उनके भार प्रतिशत के आरोही क्रम (बढ़ते क्रम) में व्यवस्थित करें: 1. एल्युमिनियम 2. कैल्शियम 3. सिलिकॉन 4. ऑक्सीजन नीचे दिए गए कूट का उपयोग करके सही उत्तर चुनिए:

The crescent-shaped sand dunes found in Sam, Jaisalmer are scientifically known as:

With reference to fjords, consider the following statements: I. They are deep, narrow inlets carved mainly by glaciers and later occupied by seawater. II. The shallow sill near their mouth is generally associated with glacial deposition rather than with tectonic uplift alone. III. They are chiefly associated with high-latitude or formerly glaciated coasts, rather than with humid tropical landscapes. How many of the statements given above are correct?